{"id":"UBUNTU-CVE-2020-13950","details":"Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service","modified":"2026-04-22T12:29:34.858485Z","published":"2021-06-10T07:15:00Z","related":["USN-4994-1"],"upstream":["CVE-2020-13950"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-13950"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-13950"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/rbe197409ae4a58b629fb792d1aed541ccbbf865121a80e1c5938d223@%3Cannounce.httpd.apache.org%3E"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2021/06/10/4"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4994-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-13950"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.3"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3","2.4.41-4ubuntu3.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.4.41-4ubuntu3.3","binary_name":"apache2"},{"binary_name":"apache2-bin","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-data","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.41-4ubuntu3.3"},{"binary_version":"2.4.41-4ubuntu3.3","binary_name":"apache2-utils"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.41-4ubuntu3.3"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.41-4ubuntu3.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-13950.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}